Means for preventing formation of rust in turbines being at rest



me 5, H923.

F. LJUNGSTRfiM MEANS FOR PREVENTING FORMATION OF RUST IN TURBINES BEING AT REST 1921 2 Sheets-Sheet 1 Filed March 23 w i 2 k mam 115 wzyamnz;

mssmm June 5, 1923.

F. LJUNGSTRC JM MEANS FOR PREVENTING FORMATION OF RUST IN TURBINES BEING AT REST Filed March 25. 1921 2 Sheets-Sheet 2 Patented June 5, 11923.

UNHTED stares Ltlttifitt PATENT @FFEQE.

MEANS FOR PREVENTING FORMATION Application filed March 23,

T 0 all whom it may concern:

Be it known that I, FREDRIK LJUNos'rnon, chief engineer, a subject of the King of Sweden, residing at Brevik, Lidingon, Sweden. have invented certain new and useful Improvements in Means for Preventing Formation of Rust in Turbines Being at Best, of which the following is a specification.

Steam and gasturbines are, as well known, connected with the inconyenience that their inner members, especially when being at rest, are liable to become rusty, and on account thereof several methods have been proposed with the object of preventing said drawback; Thus for instance efforts have been made to procure a material for the blades and other inner members not liable to become rusty. Since, however, it has proved diflicult to produce such a material of sufficient strength and not liable to rust for the manufacture of the blades, the same difficulty remains constantly. The formation of rust arises from the inner members of the turbine, when at rest, being surrounded by air or gas which, just after the stopping of the turbine, is hot and saturated with moisture adapted to deposit in the form ofwater on the inner members of the turbine while being cooled.

This invention relates to means for preventing the formation of rust on the inner members of the turbine by the air or gas within the turbine being heated or kept at such a temperature that it becomes relatively dry.

The invention consists in that a heating element is placed inside the turbine or its outlet, the element, upon each stand-still of" the turbine, heating the air or gas circulating around the inner members of the same. Preferably said heating elementconsists of a steam spiral tube connected with a boiler,

' for instance the steam boiler plant pertinent to the turbine aggregate, the steam flowing through said tube at least upon each stand-still of the turbine.

The invention is illustrated in two embodiments on the accompanying drawing, in Fig. 1 applied to an action turbine and in Fig. 2 to a turbine substantially of reaction t e.

l ieferring to Fig. 1, 1 designates the turbine disk provided with the moving blades 2. The steam flowing from the steam inlet 3 through the nozzle 4 actuates the turbine OF RUST IN TURBINES BEING AT REST.

1921. Serial Ira. 4.5%,950.

wheel and escapes through the outlet 5. The steam surrounding the inner members of the turbine is prevented from being cooled and consequently moisture is also prevented from being deposited on said inner members by.

means of the heating element 8 placed in the .outlet 5 and heating the said steam.

It is the same case in the turbine shown in Fig. 2 into which the steam entering through nozzles actuates the turbine wheel or drum 1 and then. while transmitting its effect, passes the blade system 12 to the outlet 5 where the heating element 8 is placed.

The heating element may be placed at any point within the turbine or its' steam conduits. In certain turbine types the element is preferably mounted in the steam conduit betweenthe turbine and the condenser or altogether or in part in the condenser.

The steam may flow through the element either continually or only when the turbine is at rest.

In the latter case the construction may be executed according to Fig. 2 in which 21 designates the steam inlet, 23 the inlet to the element and 24 the inlet to the turbine, 22 designating a valve device which connect's 21 either with 23 or with 24. 0bviously many other connections may be conceived so arranged that the connection between the boiler and the element is shut 05, when steam is admitted to the turbine, but

"open when said admission is shut ofi.

What I claim as new and desire to secure by Letters Patent of the United States 1s:- a

1. In combination a turbine and its casing, and a heating element placed within the casing and arranged to heat the gaseous medium in the turbine,s0 as to prevent the formation of rust.

2. In combination a turbine and its casing,

and a conduit for the gaseous medium, a

heating element being placed within said conduit and arranged to heat the gaseous medium, so as to prevent the formation of rust.

3. In combination a turbine and its casing. and an outlet conduit for the gaseous medium, a heating element being placed within saidoutlet conduit and arranged to heat the gaseous medium, so as to prevent the formation of rust.

4. In combination a turbine and its casing. and a heating element placed within the casing, said heating element being suppi ".1

with steam and arranged to heat the gaseous medium in the turbine, so as to prevent the formation of rust 5. In combination a steam turbine and its casing, a heating element placed within the casing, and a steam supply to said heating element and to-the turbine and arranged to supply steam to either, so as to heat, when supplied to the heating element, the gaseous medium in the turbine, whereby the formation of rust is prevented.

6. In combination a steamturbine and its casing, and a steam outlet from the turbine, a heating element being placed Wi thin said outlet, and a steam supply to said heating element and to the turbine and arranged to supply steam to either, so as to heat, when applied to the heating element, the gaseous medium in the turbine, whereby the formation of rust is prevented.

7. In combination a steam turbine and its casing, a heating element placed within said casing, and a steam conduit connected with the turbine and with the heating element, and means inserted in said steam con- 1,45e,oes

duit and arranged to supply steam either a the turbine or to the heating element, so as to heat. when supplied to the heating element, the gaseous medium in the turbine, whereby the formation of rust is prevented.

8. In combination a steam turbine and its casing, a steam passage within said casing, and a heating element placed in said steam passage and arranged to heat the gaseous In testimom whereof I afiix my signature in presence of two witnesses.

FREDRIK LJUNGSTRUM.

Witnesses:

INEz Swanson, STINA IJARSON'. 

